ExpiWell vs Zemi
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ExpiWell
This app facilitates experience sampling and ecological momentary assessment for research. It allows users to share opinions and experiences through surveys and daily diaries, ensuring data privacy. Researchers can collect valuable insights through this platform.
- Experience sampling method (ESM)
- Ecological momentary assessment (EMA)
- Surveys and mood tracking
- Daily diary entries
- Just-in-time adaptive interventions (JITAI)
- Digital ethnography
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ExpiWell is the premier experience sampling method (ESM) and ecological momentary assessment (EMA) app for surveys, mood tracking, daily diary, just-in-time adaptive interventions (JITAI), and digital ethnography. Market researchers, polling companies, and social scientists want your valuable opinions and experiences. Using our free app, you can share your experiences and opinions. We have real surveys that you can take. ExpiWell® ensures your privacy. We will not forward, sell, or transfer your information. ExpiWell Privacy Policy - https://app.expiwell.com/privacy ExpiWell Terms of Use - https://app.expiwell.com/tos
Zemi
This application enables participants in a specific EMA study to report their feelings at random intervals. It is designed for research purposes, allowing for real-time data collection on emotional states.
- Randomized mood reporting
- Real-time data collection
- EMA study participation
- Feeling tracking
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This app allows participants in the EMA study of the University of Southern California to tell us how they are feeling at random times of the day.
Screenshots
Verdict
The clearest difference is update cadence: ExpiWell at every 5 days against Zemi's every 7 months. ExpiWell also leads on rating (4.6 vs 4.3) and ratings volume (1.5K vs 4). On price, ads, in-app purchases and monetization model there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
ExpiWell holds the better App Store score, 4.6 against 4.3. That said, the two scores are not equally well evidenced: ExpiWell has 1.5K ratings behind it against 4, so its average is the more settled of the two.
ExpiWell ships an update every 5 days, Zemi every 7 months. The most recent releases landed on November 1, 2026 and October 24, 2026 respectively.
| Parameter | ExpiWell | Zemi |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (1.5K ratings) — better | 4.3 (4 ratings) |
| Positive reviews | 39.3% of reviews | — |
| Number of ratings | 1.5K — better | 4 |
| Update frequency | Every 5 days — better | Every 7 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 36 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Expiwell, Inc. | University of Southern California Apps |
Customer experience
ExpiWell
Zemi
Bugs and requests
ExpiWell
Reported bugs
3 issues- Login issues
- Incompatibility with certain devices
- Crashing during surveys
Requested features
2 requests- Better notification system
- More seamless interface
Zemi
Not enough reviews yet to summarise bugs or requests.
In-app purchases
ExpiWell
No in-app purchases
Zemi
No in-app purchases
